Statistical tests

Paired data
Definition Data are called paired when you choose to compare the subjects of your study two by two instead of comparing one whole group to another whole...
Sun, 29 Aug, 2021 at 8:59 PM
P-values
What is a p-value? In clinical research, the aim of a study is usually to determine the efficiency of a treatment or an intervention studying the differenc...
Sun, 29 Aug, 2021 at 9:20 PM
The Log-rank test
Definition The Log-rank test is used to compare survival or time before an event occurence between two or more groups. It compares the observed number o...
Mon, 30 Aug, 2021 at 8:47 AM
The Chi² test
Definition The Chi² test is used to compare two proportions from two or more groups. It helps to conclude if there seems to be an association between tw...
Mon, 30 Aug, 2021 at 8:49 AM
The Fisher's test
Definition The Fisher’s test is used to compare two proportions from two independent groups. It helps to conclude if there seems to be an association be...
Mon, 30 Aug, 2021 at 8:50 AM
The McNemar's test
Definition The McNemar's test is an alternative to the Chi² test, that compares proportions between group, for paired data. Paired data are data wh...
Mon, 30 Aug, 2021 at 8:51 AM
The Shapiro-Wilk's test
Definition The Shapiro-Wilk's test aims to determine whether a variable has a normal distribution (bell-shaped distribution). It is the most effici...
Mon, 30 Aug, 2021 at 8:53 AM
The Student's t-test for unpaired data
Definition The Student's t-test is used to compare two means from two independent groups. The conditions of application for this test are : the dat...
Mon, 30 Aug, 2021 at 8:54 AM
The Mann-Whitney's test
Definition The Mann-Withney test is a non-parametric test used to compare the distribution of a numeric variable from two independent groups. It is an a...
Mon, 30 Aug, 2021 at 9:07 AM
The Welch's test
Definition The Welch's test is a non-parametric test used to compare two means from two independent groups. It was historically used as an alternat...
Mon, 30 Aug, 2021 at 9:10 AM